Weather API not support for some WOIED

Hi,
 I am using PlaceFinder and Weather APIs in my iPhone application. What I am doing is track the user current location. Then retrieve WOEID for that location via PlaceFinder. Then retrieve weather info for that WOEID.

Problem is : Weather API says "Invalid input" for some WOEIDs. So, my app crash. How can I know what are the supported WOEIDs for Weather API?? 
 
Thanks,
Sanj